diff --git a/src/colvar/RDC.cpp b/src/colvar/RDC.cpp
index b5022e37313879060168d77f135a2e7091dc34a0..08378e203d1d8b234296682a7e911b3bdfe8c6ee 100644
--- a/src/colvar/RDC.cpp
+++ b/src/colvar/RDC.cpp
@@ -351,6 +351,7 @@ void RDC::calculate()
     }
     gsl_matrix_free(coef_mat);
     gsl_matrix_free(A);
+    gsl_matrix_free(V);
     gsl_vector_free(rdc_vec);
     gsl_vector_free(bc);
     gsl_vector_free(Stmp);